A new compound developed in the lab was tested as a mutagen. When the Ames test was performed, the results were numerous bacterial colonies following exposure. This result means the chemical
A) is safe.
B) is radioactive.
C) would be a great candidate to use for chemotherapy.
D) is a mutagen and also may be a carcinogen.
E) causes apoptosis.
Answer: D
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The upper forelimbs of humans and bats have fairly similar skeletal structures, whereas the corresponding bones in whales have very different shapes and proportions. However, genetic data suggest that all three kinds of organisms diverged from a common ancestor at about the same time. Which of the following is the most likely explanation for these data?
A. Natural selection in an aquatic environment resulted in significant changes to whale forelimb anatomy. B. Forelimb evolution was adaptive in people and bats, but not in whales. C. Genes mutate faster in whales than in humans or bats. D. Whales are not properly classified as mammals. E. Humans and bats evolved by natural selection, and whales evolved by Lamarckian mechanisms.
What is one major limitation of two-dimensional gel electrophoresis (2DGE)?
A) 2DGE is useful only in separating eukaryotic gene products. B) It is extremely costly to execute in a typical molecular biology laboratory. C) Only the most abundant products are detected. D) 2DGE can be run only on nucleic acids. E) When products are separated, they tend to leach out of the gel matrix.
Which disease affects the liver and could be transferred by an organ transplant?
A) hepatitis C B) diabetes C) gonorrhea D) tuberculosis
Cyclic AMP activates protein kinase C in producing a cell response.
Answer the following statement true (T) or false (F)